CN114213199B - Cleaning material and method for cleaning high-burning-rate solid propellant adhered in mixing equipment - Google Patents
Cleaning material and method for cleaning high-burning-rate solid propellant adhered in mixing equipment Download PDFInfo
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- CN114213199B CN114213199B CN202111525486.7A CN202111525486A CN114213199B CN 114213199 B CN114213199 B CN 114213199B CN 202111525486 A CN202111525486 A CN 202111525486A CN 114213199 B CN114213199 B CN 114213199B
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- cleaning material
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- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
- C06B21/00—Apparatus or methods for working-up explosives, e.g. forming, cutting, drying
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- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06D—MEANS FOR GENERATING SMOKE OR MIST; GAS-ATTACK COMPOSITIONS; GENERATION OF GAS FOR BLASTING OR PROPULSION (CHEMICAL PART)
- C06D5/00—Generation of pressure gas, e.g. for blasting cartridges, starting cartridges, rockets
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- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Accessories For Mixers (AREA)
- Processing Of Solid Wastes (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
The scheme discloses a cleaning material and a method for cleaning a high-burning-rate solid propellant adhered in mixing equipment, wherein the method comprises the steps of adding the cleaning material into a mixer; operating a mixer, and fully coating the cleaning material with the high-burning-rate solid propellant remained in the mixer through stirring; transferring the cleaning material mixed with the high-burn-rate solid propellant from the mixer; and detecting the removed cleaning material, and if the cleaning material meets the preset safety condition, reusing the cleaning material, and if the cleaning material does not meet the preset safety condition, treating the cleaning material by adopting an incineration method. The dispersed phase and the continuous phase of the cleaning material have low toxicity, the prepared cleaning material has strong adhesion, the viscosity is more than or equal to 3500Pas measured by adopting a cylindrical rotor at 45 ℃, the rheological property that the viscosity is reduced along with the increase of the shearing action is adopted, and the cleaning material does not have chemical reaction with each component of the high-burning-rate solid propellant. Solves the problem that the existing cleaning process needs operators to manually scrape high-burning-rate propellant with higher danger face to face.
Description
Technical Field
The invention relates to the field of solid propellant manufacturing, in particular to a cleaning material and a method for cleaning high-burning-speed solid propellant adhered in mixing equipment.
Background
The solid rocket propellant is a power source for the launching and flying of the solid rocket, and energy-containing substances are bonded together to form a uniform body through a bonding agent with high viscosity. In the preparation process of the propellant, the adhesive and the energetic substance are uniformly mixed, which is one of the key links of the preparation of the propellant. After the binder and the energetic substance are mixed, the mixture is transferred out of the mixer, but because the binder has high viscosity, a layer of thick residual propellant is accumulated in the mixing equipment after the propellant is mixed and removed. As the burning rate of the solid propellant increases, the more viscous the solid propellant is during mixing, the greater the amount of residual propellant. At the same time, the danger of the propellant also increases significantly with an increase in the burning rate. Namely, in the preparation process of the high-burning-rate propellant, when the mixing and stirring are finished, a large amount of residual propellant with high danger can remain in the mixer.
At present, the cleaning process of the residual propellant in the mixer mainly adopts manual scraping operation, an operator needs to hold a cleaning tool in the process, and certain dangerous residual propellant is directly scraped. Because the viscosity of the propellant is high, the scraping force of an operator is not easy to control, and the risk of safety accidents caused by the fact that the propellant residual medicine is excited due to too high force in the cleaning process exists.
The safety risk of cleaning residual propellant in a mixer by manual cleaning after the mixing of the high-burning-speed propellant is finished is eliminated.
Disclosure of Invention
It is an object of the present solution to provide a cleaning material for cleaning high burn rate solid propellants adhering within a mixing apparatus.
A second object of the present solution is to provide a method for cleaning mixing equipment to which a high burning rate solid propellant adheres. The method has the characteristics of safety, good compatibility with propellant and good cleaning effect.
In order to achieve the purpose, the scheme is as follows:
a cleaning material for cleaning high burn rate solid propellant adhered within a mixing apparatus, said cleaning material having a viscosity of greater than or equal to 3500Pas; viscosity decreases with increasing shear; the viscosity is measured at 45 ℃ using a cylindrical rotor.
Preferably, the cleaning material does not chemically react with the components of the high burn rate solid propellant.
In a second aspect, there is provided a method of cleaning a mixing apparatus to which a high burn rate solid propellant is adhered, the method comprising the steps of:
adding a cleaning material into the mixing device;
operating the mixing equipment, and stirring to ensure that the cleaning material completely coats the high-burning-rate solid propellant remained in the mixing equipment;
removing the cleaning material mixed with the high burn rate solid propellant from the mixing apparatus;
and detecting the removed cleaning material, and if the cleaning material meets the preset safety condition, reusing the cleaning material, and if the cleaning material does not meet the preset safety condition, treating the cleaning material by adopting an incineration method.
Preferably, the viscosity of the cleaning material is greater than or equal to 3500Pa; viscosity decreases with increasing shear; the viscosity is measured at 45 ℃ using a cylindrical rotor.
Preferably, the cleaning material does not chemically react with the components of the high burn rate solid propellant.
Preferably, the mixing device is a vertical mixer.
Preferably, the mixing apparatus is operated at a speed of agitation after the addition of the cleaning material which is comparable to the speed at which the binder and energetic materials are mixed in the mixing apparatus to form a high burn rate solid propellant.
Preferably, the standard for detecting the removed cleaning materials is GJB770B-601.1 and GJB770B-602.1 in the national military standard.
Preferably, the impact sensitivity and the friction sensitivity of the removed cleaning material are detected, if the detection results are both 0%, the cleaning material can be continuously used, and if the detection results are more than 0%, the removed cleaning material is treated by an incineration method.
The scheme has the following beneficial effects:
the present invention provides a method for safely cleaning mixing equipment adhered with high-burning-rate solid propellant.
Drawings
In order to illustrate the implementation of the solution more clearly, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the solution, and that other drawings may be derived from these drawings by a person skilled in the art without inventive effort.
FIG. 1 is a schematic diagram of a solid propellant mixing and discharging process;
FIG. 2 is a comparative plot of cleaning effectiveness of the cleaning material of example 1 against adhered high burn rate propellant mixer;
FIG. 3 is a comparative plot of cleaning effect of cleaning material of example 2 on adhered high fire rate propellant mixer.
Detailed Description
Embodiments of the present solution are described in further detail below. It is clear that the described embodiments are only a part of the embodiments of the solution, and not an exhaustive list of all embodiments. It should be noted that, in the present embodiment, features of the embodiment and the embodiment may be combined with each other without conflict.
The terms first, second and the like in the description and in the claims, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be implemented in other sequences than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be understood that the term "and/or" as used herein is merely a relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B, may represent: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
At present, the vertical mixer is most commonly used in the solid propellant industry, the vertical mixer has the characteristics of good mixing performance and high reliability, and the prepared propellant has good combustion performance and mechanical property.
The vertical mixer mainly comprises a mixing paddle, a mixing pot and a support, wherein the mixing paddle is fixed on the support and can only move up and down, and the bottom of the mixing pot is provided with a roller which can move freely and can also be clamped on the support to move up and down. The mixing process comprises the following steps: firstly, putting all components of a mixed propellant into a mixing pot; then pushing the bracket to clamp, and enabling the mixing pot and the mixing paddle to move relatively to each other, so that the mixing paddle completely enters the mixing pot; then the mixing paddle starts to rotate, and all the components of the propellant are mixed and stirred uniformly; after mixing, the mixing pot and the mixing paddle are separated, the mixing pot is descended to the ground and then pulled out from the support, and the propellant in the mixing pot is poured out. Because of the high viscosity of the binder in the composition, a thick layer of residual propellant may accumulate in the mixing kettle and paddle after the propellant is mixed and poured. As the burning rate of the solid propellant increases, the more viscous the solid propellant is during mixing, the greater the amount of residual propellant. At the same time, the danger of the propellant increases considerably with an increase in the burning rate. Namely, in the preparation process of the high-burning-rate propellant, a large amount of residual propellant with high danger can be remained in a mixing pot and a mixing paddle after the mixing and stirring are finished. The structure of the vertical mixer is shown in FIG. 1.
The safety risk of cleaning residual propellant in the mixer by manual cleaning after the mixing of the high-burning-rate propellant is finished is eliminated. The application provides a method for safely cleaning a vertical mixer adhered with a high-burning-rate solid propellant. High burning rate solid propellants are typically viscoelastic materials, have certain newtonian bulk properties, are relatively viscous and do not change with changes in shear rate, and are highly adherent, which is a major reason why such propellant mixers are difficult to clean. Meanwhile, the high-burning-rate propellant is used as a viscoelastic material and has the characteristic of wall slippage, namely, if enough shearing stress is applied to the propellant adhered to the wall, the propellant can be separated from the wall to generate slippage, so that a mixer adhered with the high-burning-rate propellant can be cleaned accordingly.
The utility model provides a clearance scheme is provided for realizing the vertical mixer of the high burning rate solid propellant of safe clearance adhesion, put into the mixer through the compound clearance material of inertia polymer that will prepare, utilize the compound clearance material of inertia polymer to wrap up high burning rate propellant completely, restart mixer paddle rotates, transmit the effort for the compound clearance material of inertia polymer by the paddle, the high burning rate propellant of adhesion on pot wall and paddle is given in the biography again, make it produce the wall and slide the dispersion in the compound clearance material of inertia polymer, propellant on the paddle receives inert material's reaction force simultaneously, also will produce the wall and slide the effect, break away from on the paddle and get into in the compound clearance material of inertia polymer. And finally, manually transferring the inert polymer composite cleaning material after cleaning.
The method for cleaning the vertical mixer adhered with the high-burning-rate solid propellant comprises the following steps:
design and preparation of S1 inert polymer composite cleaning material
Designing and preparing an inert material of a vertical mixer suitable for cleaning and adhering a high-burning-rate solid propellant;
s2, manually transferring the prepared inert composite material to a vertical mixer adhered with a high-burning-rate solid propellant;
s3, normally operating the mixer to enable the high-burning-rate propellant on the pot wall and the blades to be completely wrapped by the inert material, and transmitting the acting force to the high-burning-rate propellant on the pot wall and the blades from the cleaning inert material in the moving process of the blades;
s4, manually transferring the inert composite material mixed with the high-burning-rate solid propellant from the mixer, placing the inert composite material at a proper position, testing the safety performance of the inert composite material, reusing the inert composite material after the inert composite material is qualified, and processing the inert composite material after the inert composite material is unqualified by adopting an incineration method.
In the step S1, the dispersed phase and the continuous phase of the inert material of the vertical mixer suitable for cleaning and adhering the high-burning-rate solid propellant have low toxicity, the prepared cleaning material has strong adhesion, the viscosity is more than or equal to 3500Pas when the viscosity is measured at 45 ℃ by adopting a cylinder rotor, the rheological property that the viscosity is reduced along with the increase of the shearing action is realized, and the chemical reaction does not occur with each component of the high-burning-rate solid propellant;
in the step S2, the rotating speed of the paddle movement is within the normal rotating speed range when the high-burning-rate solid propellant is mixed, so that the normal operation of the mixing machine is ensured;
in the step S4, after each use of the inert material of the vertical mixer suitable for cleaning and adhering the high-burning-rate solid propellant is finished, the impact sensitivity and the friction sensitivity of the inert material are tested by adopting GJB770B-601.1 and 602.1 in national military standards, if the test results are both 0%, the material can be continuously used, and if the test results are more than 0%, the inert material is treated by adopting an incineration method.
This embodiment is described below by way of specific examples.
Example 1
The cleaning material formula of the vertical mixer suitable for cleaning the adhered high-burning-rate solid propellant is designed, and the specific design principle is that the cleaning material formula is safe, good in compatibility with the propellant and good in cleaning effect. The formulation composition of the cleaning material was designed according to the design rules as shown in table 1.
TABLE 1
In consideration of different rheological properties of the polymer composite material under different shearing actions, in order to ensure that the prepared cleaning material is consistent with the state in the cleaning process, a mixer for preparing the propellant is adopted for preparing the cleaning material.
The prepared cleaning material is put into a vertical mixer adhered with high-burning-rate propellant, the paddle is started to rotate to start the cleaning process, and the effects before and after cleaning are shown in figures 2A and 2B.
It can be seen from fig. 2A and 2B that the cleaning material has a good cleaning action on the mixer, and the high-burn-rate propellant is fully incorporated into the cleaning material. The cleaning material of example 1 has good fluidity, and can be poured out in a pouring manner after cleaning, and the cleaning material with safe wall surfaces and blade adhesion has no safety risk, and can be cleaned manually.
The cleaning material is subjected to safety performance test, the impact sensitivity test result is 0% in response, and the friction sensitivity test result is 0% in response, so that the cleaning material has extremely high safety characteristic, and can play a role in safely cleaning the vertical mixer adhered with the high-burning-speed propellant.
Example 2
The formulation composition of the designed cleaning material is shown in table 2.
TABLE 2
The preparation of the cleaning material was carried out using a mixer for propellant preparation.
The prepared cleaning material is put into a vertical mixer adhered with a high-burning-rate propellant, the paddle is started to rotate to start the cleaning process, and the effects before and after cleaning are shown in figures 3A and 3B.
It can be seen from fig. 3A and 3B that the cleaning material has a good cleaning effect on the mixer, the high-burning-rate propellant on the pot wall and the pot paddle completely enters into the cleaning material, and the mixer does not adhere to the cleaning material in a large area, so that the cleaning effect is remarkable.
The cleaning material of embodiment 2 has poor fluidity, and can be shoveled out only by manual work after the cleaning is finished, the scraping frequency in the process is greatly reduced, and the cleaning material is safer than the taking-out process of embodiment 2.
The cleaning material is subjected to safety performance test, the impact sensitivity test result is 0% in response, and the friction sensitivity test result is 0% in response, so that the cleaning material has extremely high safety characteristic, and can play a role in safely cleaning the vertical mixer adhered with the high-burning-speed propellant.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (9)
1. A cleaning material for cleaning high burning rate solid propellant adhered in a mixing device, wherein the viscosity of the cleaning material is greater than or equal to 3500Pas, and the viscosity decreases with the increase of shearing action; the viscosity is measured by adopting a cylinder rotor at 45 ℃;
the cleaning material comprises aluminum powder, polyvinyl chloride and hydroxyl-terminated polybutadiene;
the use method of the cleaning material comprises the following steps:
adding a cleaning material into the mixing device;
operating the mixing equipment, and completely coating the cleaning material with the high-burning-rate solid propellant remained in the mixing equipment by stirring;
removing the cleaning material mixed with the high burn rate solid propellant from the mixing apparatus;
and detecting the removed cleaning material, and if the cleaning material meets the preset safety condition, reusing the cleaning material, and if the cleaning material does not meet the preset safety condition, treating the cleaning material by adopting an incineration method.
2. The cleaning material for cleaning high fire rate solid propellant adhered to mixing apparatus of claim 1, wherein the cleaning material is chemically non-reactive with the components of the high fire rate solid propellant.
3. A method of cleaning a mixing apparatus to which a high burning rate solid propellant is adhered using the cleaning material of claim 1, comprising the steps of:
adding a cleaning material into the mixing device;
operating the mixing equipment, and completely coating the cleaning material with the high-burning-rate solid propellant remained in the mixing equipment by stirring;
removing the cleaning material mixed with the high burn rate solid propellant from the mixing apparatus;
and detecting the removed cleaning material, and if the cleaning material meets the preset safety condition, reusing the cleaning material, and if the cleaning material does not meet the preset safety condition, treating the cleaning material by adopting an incineration method.
4. The method of claim 3, wherein the cleaning material has a viscosity of 3500Pas or more, and the viscosity decreases with increasing shear; the viscosity is measured at 45 ℃ using a cylindrical rotor.
5. The method of cleaning a mixing apparatus to which a high burn rate solid propellant is adhered according to claim 3, wherein the cleaning material does not chemically react with the components of the high burn rate solid propellant.
6. The method of claim 3, wherein the mixing apparatus is a vertical mixer.
7. The method of claim 3, wherein the mixing device is operated at a speed equivalent to the speed at which the binder and energetic materials are mixed in the mixing device to form the high burn rate solid propellant.
8. The method for cleaning the mixing equipment adhered with the high-burning-rate solid propellant according to claim 3, wherein the standards for detecting the removed cleaning material are GJB770B-601.1 and GJB770B-602.1 in the national military standard.
9. The method for cleaning the mixing equipment adhered with the high-burning-rate solid propellant according to claim 3, wherein the impact sensitivity and the friction sensitivity of the removed cleaning material are detected, if the detection results are both 0%, the cleaning material can be continuously used, and if the detection results are more than 0%, the removed cleaning material is treated by using an incineration method.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111525486.7A CN114213199B (en) | 2021-12-14 | 2021-12-14 | Cleaning material and method for cleaning high-burning-rate solid propellant adhered in mixing equipment |
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| CN202111525486.7A CN114213199B (en) | 2021-12-14 | 2021-12-14 | Cleaning material and method for cleaning high-burning-rate solid propellant adhered in mixing equipment |
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| CN114213199B true CN114213199B (en) | 2023-01-24 |
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| RU2046124C1 (en) * | 1992-05-06 | 1995-10-20 | Центр "ХИМЭК" | Method of cleaning of rocket propellant tanks from remaining propellant of unsymmetrical dimethyl hydrazine |
| WO1999043446A1 (en) * | 1998-02-27 | 1999-09-02 | Cri Recycling Service, Inc. | Removal of contaminants from materials |
| US7053040B2 (en) * | 1999-11-10 | 2006-05-30 | Eco-Safe Technologies, L.L.C. | Autonomous cleaning composition and method |
| CN112473532B (en) * | 2020-11-26 | 2023-01-31 | 湖北三江航天江河化工科技有限公司 | Automatic cleaning device and cleaning method for vertical mixer blade |
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